US20170269349A1 - Imaging module, endoscope, and method of manufacturing imaging module - Google Patents
Imaging module, endoscope, and method of manufacturing imaging module Download PDFInfo
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- US20170269349A1 US20170269349A1 US15/434,302 US201715434302A US2017269349A1 US 20170269349 A1 US20170269349 A1 US 20170269349A1 US 201715434302 A US201715434302 A US 201715434302A US 2017269349 A1 US2017269349 A1 US 2017269349A1
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- image
- sensing device
- lens
- imaging module
- lens unit
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2476—Non-optical details, e.g. housings, mountings, supports
- G02B23/2484—Arrangements in relation to a camera or imaging device
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/05—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances characterised by the image sensor, e.g. camera, being in the distal end portion
- A61B1/051—Details of CCD assembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
-
- H04N5/2254—
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
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- H04N2005/2255—
Definitions
- the present invention relate to an imaging module, an endoscope, and a method of manufacturing an imaging module.
- An imaging module used in an endoscope or the like is provided with, for example, an image-sensing unit including an image-sensing device and a lens unit (lens) optically connected to the image-sensing device (for example, refer to Japanese Patent No. 5450704, and hereinbelow referred to as Patent Document 1).
- an image-sensing device (particularly, a cover that covers the surface of the image-sensing device) and a lens unit are fixed to each other via an adhesive.
- One aspect of the invention has an object thereof to provide an imaging module, an endoscope, and a method of manufacturing an imaging module, which can stably obtain excellent imaging performance.
- An imaging module includes: an image-sensing unit that includes an image-sensing device; a lens that has a front end and is optically connected to the image-sensing device; and a frame that is fixed in position with respect to the image-sensing device and includes a lens barrel having an insertion space, into which the front end is to be inserted in at least an optical axis direction.
- the insertion space is capable of receiving the lens in the direction such that the lens approaches the image-sensing device.
- the lens is fixed to the lens barrel at a position at which the lens is optically connected to the image-sensing device.
- the frame has: a first end at which an insertion opening is formed, the lens being to be inserted into the insertion opening; and a second end at which a positioning hole is formed, the positioning hole determining the position of the image-sensing device so that a light-receiving face is exposed to the insertion space.
- the positioning hole may be capable of limiting movement of the image-sensing device in a direction intersecting with the optical axis direction of the image-sensing device.
- the frame may include a movement limiter that limits the image-sensing device fixed in position by the positioning hole from moving into the insertion space.
- the lens barrel may have one or more slit-shaped cutouts formed in a direction from the first end to the second end.
- the frame may be made of a metal.
- An endoscope according to a second aspect of the invention includes the imaging module according to the aforementioned first aspect.
- a method of manufacturing an imaging module includes: preparing: an image-sensing unit comprising an image-sensing device; a lens having a front end; and a frame comprising a lens barrel having an insertion space into which the front end is to be inserted in at least an optical axis direction, the insertion space being capable of receiving the lens in a direction such that the lens approaches the image-sensing device in a state where movement of the lens in a direction intersecting with the optical axis direction is limited; positioning the image-sensing device of the image-sensing unit and the frame (first step); and inserting the lens into the insertion space and positioning the lens in the lens barrel at a position at which the lens is optically connected to the image-sensing device (second step).
- the imaging module since the imaging module includes the frame that can receive the lens in a state where movement of the lens in the direction intersecting with the optical axis is limited, it is possible to fix the position of the lens with a high level of accuracy at the position at which the lens is optically connected to the image-sensing device.
- FIG. 1A is a front view showing an imaging module according to the first embodiment.
- FIG. 1B is a cross-sectional side view showing the imaging module according to the first embodiment.
- FIG. 2A is a view showing a frame of the imaging module according to the first embodiment and is a front view showing a frame.
- FIG. 2B is a view showing the frame of the imaging module according to the first embodiment and is a cross-sectional view taken along the line I-I′ shown in FIG. 2A .
- FIG. 2C is a view showing the frame of the imaging module according to the first embodiment and is a cross-sectional view taken along the line II-IF shown in FIG. 2A .
- FIG. 2D is a view showing the frame of the imaging module according to the first embodiment and is a rear view showing the frame.
- FIG. 3 is a cross-sectional view showing a front-end structure of an endoscope using the imaging module according to the first embodiment.
- FIG. 4A is an explanatory view showing a method of manufacturing the imaging module according to the first embodiment.
- FIG. 4B is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment.
- FIG. 4C is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment.
- FIG. 5A is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment.
- FIG. 5B is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment.
- FIG. 5C is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment.
- FIG. 6A is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment.
- FIG. 6B is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment.
- FIG. 7A is a front view showing an imaging module according to a second embodiment and is a view showing a state where a lens unit is removed from the imaging module.
- FIG. 7B is a perspective view showing the imaging module according to the second embodiment and is a view showing a state where the lens unit is removed from the imaging module.
- FIG. 8 is a perspective view showing the imaging module according to the second embodiment and is a view showing a state where the lens unit is inserted into a frame.
- FIG. 9A is a view showing a modified example according to a frame and is a front view showing the frame.
- FIG. 9B is a view showing a modified example according to a frame and is a cross-sectional view shown in FIG. 9A .
- FIG. 9C is a view showing a modified example according to a frame and is a cross-sectional view IV-IV′ shown in FIG. 9A .
- FIG. 9D is a view showing a modified example according to a frame and is a rear view showing the frame.
- FIG. 1A is a front view showing an imaging module 100 according to a first embodiment of the invention.
- FIG. 1B is a cross-sectional side view showing the imaging module 100 .
- the position at which an image-sensing device 4 is disposed on a flexible wiring substrate 10 is referred to as a front side
- the opposite side of the front side is referred to as a rear side.
- the XYZ orthogonal coordinate system may be adopted.
- the Z-direction is a front-back direction of the imaging module
- the X-direction is a direction orthogonal to the Z-direction and is perpendicular to a paperface in FIG. 1B .
- the Y-direction is a direction orthogonal to the X-direction and the Z-direction and is a vertical direction in FIG. 1B .
- the imaging module 100 includes an image-sensing unit 102 , a frame 31 , and a lens unit 20 (lens).
- the image-sensing unit 102 includes the flexible wiring substrate 10 (wiring part) and the image-sensing device 4 which is mounted on the flexible wiring substrate 10 .
- the flexible wiring substrate 10 includes: a device-mounted portion 11 ; and a pair of rear portions 12 and 13 (first rear portion 12 and second the rear portion 13 ) which are bent at both end portions of the device-mounted portion 11 , are directed in the thickness direction of the device-mounted portion, and extend toward the rear side.
- Wiring 14 is formed at least on an outer surface of the flexible wiring substrate 10 .
- the flexible wiring substrate 10 for example, a flexible wiring substrate having one surface on which wiring is formed can be used.
- the front surface (outer surface) of the device-mounted portion 11 is a mount surface 11 a on which the image-sensing device 4 is to be mounted.
- a conductor 2 is electrically connected via a conductive connector 15 made of solder or the like to the wiring 14 formed on the rear portion 13 of the flexible wiring substrate 10 .
- the conductor 2 is drawn from, for example, an electrical cable (not shown in the figure).
- the back (portion including the conductive connector 15 ) of the rear portions 12 and 13 of the flexible wiring substrate 10 is covered with an insulating tube 16 having, for example, electrical insulation.
- the insulating tube 16 is made of, for example, a resin material such as a silicone resin.
- the flexible wiring substrate 10 is an example of wiring part.
- CMOS complementary metal oxide semiconductor
- the image-sensing device 4 includes an image capturer 3 that is to be optically connected to the lens unit 20 .
- the image capturer 3 is provided on a front surface of the image-sensing device 4 .
- the shape of the image-sensing device 4 as seen in the front-back direction is, for example, a rectangular shape (for example, square).
- the image capturer 3 is electrically connected to the wiring 14 of the flexible wiring substrate 10 via an electrical circuit formed in the image-sensing device 4 .
- the direction of the optical axis A of the image capturer 3 coincides with, for example, the front-back direction.
- a light-receiving face 3 a of the image capturer 3 is the surface intersecting with the optical axis A 1 of the lens unit 20 .
- the light-receiving face 3 a of the image capturer 3 is the surface intersecting with the axis direction of the front end (forward end) of the conductor 2 .
- the light-receiving face 3 a is, for example, a surface along the XY plane.
- a bump 4 a that is electrically connected to an electrical circuit of the image-sensing device 4 is formed on the back surface of the image-sensing device 4 .
- the bump 4 a is, for example, a solder bump, a stud bump, a plated bump, or the like.
- the image-sensing device 4 is electrically connected to the mount surface 11 a of the device-mounted portion 11 of the flexible wiring substrate 10 via the bump 4 a by use of, for example, a flip-chip method.
- the lens unit 20 includes a cylindrical lens barrel 20 a ; and an object lens 23 that is incorporated into the inside of the lens barrel 20 a.
- the lens unit 20 is provided in the attitude in which the front end of the lens unit 20 in the direction of the optical axis A 1 (the front end 23 a of the object lens 23 in the direction of the optical axis A 1 ) is directed to the image-sensing device 4 .
- the optical axis A 1 of the lens unit 20 coincides with the optical axis A 2 of the image capturer 3 of the image-sensing device 4 .
- an outer diameter of the lens unit 20 be smaller than the maximum length of the external shape of the image-sensing device 4 (maximum length of the external shape in the XY plane).
- the length of the external shape of the imaging module 100 can be limited, it is possible to reduce the imaging module 100 in size.
- Light guided from the front side of the imaging module 100 through the object lens 23 can be imaged by the lens unit 20 on the light-receiving face 3 a of the image capturer 3 of the image-sensing device 4 .
- the lens unit 20 is an example of a lens.
- the front end (front end 23 a ) of the lens unit 20 in the direction of the optical axis A 1 be located at the front side of the light-receiving face 3 a of the image capturer 3 so as to be separated from the light-receiving face.
- a space between the front end 23 a and the light-receiving face 3 a is an air space 22 .
- the front end 23 a and the light-receiving face 3 a are not in contact with each other, and another member is not interposed between the front end 23 a and the light-receiving face 3 a.
- the frame 31 includes: a wall end 39 which is formed in a rectangular plate shape; and a lens barrel 32 which extends forward from the peripheral edge portion of the wall end 39 .
- the wall end 39 is formed at the rear end of the frame 31 (the other end, second end).
- the lens barrel 32 has an external appearance that is formed in a square tubular shape having four planar outer surfaces 31 a.
- An opening of the front end of the lens barrel 32 (one end, first end) is referred to as an insertion opening 34 .
- An internal space of the lens barrel 32 is an insertion space 33 into which the lens unit 20 is to be inserted.
- the insertion space 33 is formed in, for example, a cylindrical shape having the central axis extending in the front-back direction, and the cross-sectional shape of the insertion space is circular in shape.
- an internal diameter (length of the internal shape) of the insertion space 33 be substantially the same as the outer diameter (the length of the external shape) of the lens unit 20 or slightly larger than the outer diameter of the lens unit 20 .
- the direction intersecting with the direction of the optical axis A 1 is, for example, a direction orthogonal to the direction of the optical axis A 1 such as X-direction or Y-direction.
- the insertion space 33 can limit movement of the lens unit 20 in the direction intersecting with the direction of the optical axis A 1 , it is possible to limit the lens unit 20 from tilting.
- the direction of the optical axis A 1 of the lens unit 20 does not vary.
- the insertion space 33 is configured to receive the lens unit 20 in a state where the lens unit 20 can be movable in the direction such that it comes close to or approaches the image-sensing device 4 and can accommodate the portion including the front end (front end 23 a ) at least in the direction of the optical axis A 1 of the lens unit 20 .
- the length L 1 of the lens barrel 32 in the front-back direction can be determined to be, for example, 1.5 times or more of the internal diameter D 1 of the lens barrel 32 .
- the length L 1 can be determined to be, for example, three times or less of the internal diameter D 1 .
- the length L 1 be determined so that part of the lens unit 20 protrudes forward from the lens barrel 32 .
- the protruding length of the lens unit 20 from the lens barrel 32 can be determined to be, for example, one-third or more of the overall length of the lens unit 20 .
- the lens unit 20 that is inserted into the insertion space 33 is fixed to the lens barrel 32 at the position at which the lens unit is optically connected to the image-sensing device 4 .
- the lens unit 20 can be fixed to the lens barrel 32 by use of, for example, an adhesive 41 (described below) or the like.
- the center position of the image-sensing area of the light-receiving face 3 a of the image-sensing device 4 may be displaced from the center of the front surface (surface including the light-receiving face 3 a ) of the image-sensing device 4 (decentering position).
- the position at which the insertion space 33 is to be formed in the XY plane can be the decentering position which corresponds to the position of the image-sensing area of the image-sensing device 4 .
- the influence of the displacement due to decentering (for example, displacement in an optical axis position) on imaging performance is likely to be larger as compared with the case where the outer diameter of the lens unit 20 is larger.
- the frame 31 is used in the imaging module 100 , the aforementioned displacement does not occur, and even in cases where an outer diameter of the lens unit 20 is small, it is possible to optically connect the lens unit 20 and the image-sensing device 4 with a high degree of accuracy.
- a positioning hole 35 into which the image-sensing device 4 is to be inserted is formed on the wall end 39 .
- the positioning hole 35 is formed so as to be able to limit the image-sensing device 4 from moving in a direction intersecting with the front-back direction (i.e., a direction intersecting with the optical axis A 2 of the image-sensing device 4 ).
- the inner surface of the positioning hole 35 come into contact with or come close to the side surface of the image-sensing device 4 at least two points different from each other.
- the positioning hole 35 is formed in a rectangular shape (for example, square shape) as seen from rear (refer to FIG. 2D ).
- the image-sensing device 4 As long as the side surface of the image-sensing device 4 comes into contact with or comes close to the inner surfaces corresponding to the adjacent two sides of the four sides of the positioning hole 35 , it is possible to limit the image-sensing device 4 from moving in a plurality of different directions.
- the length of the internal shape (for example, the length of one side of the rectangular shape) of the positioning hole 35 be substantially the same as the length of the external shape of the image-sensing device 4 (for example, the length of one side of the rectangular shape) or slightly larger than the length of the external shape of the image-sensing device 4 .
- the positioning hole 35 penetrates through the wall end 39 , and the light-receiving face 3 a of the image-sensing device 4 that is inserted into the positioning hole 35 can be disposed at the position at which the light-receiving face 3 a is exposed to the insertion space 33 .
- the positioning hole 35 is formed so that the optical axis A 2 of the image-sensing device 4 coincides with the optical axis A 1 of the lens unit 20 provided in the insertion space 33 .
- the length of the diagonal line of the positioning hole 35 formed in a rectangular shape is longer than the length of the internal shape (internal diameter) of the insertion space 33 .
- a stepped portion due to a difference in length of the internal shape between the positioning hole 35 and the insertion space 33 is formed at the portion of the positioning hole 35 which includes four corners, and the back surface of the stepped portion is a movement limiter 37 that limits the image-sensing device 4 inserted into the positioning hole 35 from moving into the insertion space 33 .
- the movement limiter 37 is a contact face parallel to, for example, the XY plane.
- the movement limiter 37 is formed at each of the four corners of the positioning hole 35 , the image-sensing device 4 comes into contact with the movement limiter 37 at the four corner portions, and the movement limiter 37 is fixed in position with a high degree of accuracy.
- the frame 31 be made of a metal such as stainless steel or an aluminum alloy.
- the frame 31 made of a metal, since a degree of rigidity and a surface hardness of the frame 31 can be higher, it is possible to improve accuracy of positioning of the lens unit 20 with respect to the image-sensing device 4 .
- FIG. 3 is a cross-sectional view showing a front-end structure of an endoscope 101 using the imaging module 100 .
- the endoscope 11011 has a front-end structure including the housing 50 and the imaging module 100 provided inside the attachment hole 51 of the housing 50 .
- the attachment hole 51 includes: the frame 31 ; a first insertion portion 51 a through which the image-sensing device 4 or the like is inserted; and a second insertion portion 51 b through which part of the lens unit 20 is inserted.
- the length of the internal shape of the first insertion portion 51 a is substantially the same as the length of the external shape of the frame 31 or is slightly larger than the length of the external shape of the frame 31 .
- the length of the internal shape (internal diameter) of the second insertion portion 51 b is substantially the same as the length of the external shape (outer diameter) of the lens unit 20 or is larger than the length of the external shape of the lens unit 20 .
- the first insertion portion 51 a may be filled with an adhesive 42 .
- the inner surface of the second insertion portion 51 b can be adhesively-fixed to the outer surface of the lens unit 20 by an adhesive (not shown in the figure).
- the accuracy of the length of the external shape of the frame 31 is sufficiently higher than that of the length of the internal shape of the first insertion portion 51 a , even where the accuracy of the lengths of other elements constituting the imaging module 100 is low, it is possible to accurately fix the position of the imaging module 100 with respect to the housing 50 .
- a high degree of accuracy is not required for the length of the second insertion portion 51 b , and even where a space is provided between the inner surface of the second insertion portion 51 b and the outer surface of the lens unit 20 , no problems occur.
- the manufacture of the imaging module 100 and the housing 50 becomes easy, and it is possible to improve the manufacturing yield thereof.
- the imaging module 100 uses the frame 31 , it is possible to design the frame 31 in accordance with the position or the like of the lens unit 20 which is required to correspond to the product specification of the endoscope 101 .
- the imaging module 100 since it is possible to form the frame 31 in shape corresponding to the housing 50 , it is possible to accurately dispose the lens unit 20 or the like at a required position.
- the image-sensing device 4 of the image-sensing unit 102 is inserted into the positioning hole 35 of the frame 31 from the back.
- the image-sensing device 4 moves forward until coming into contact with the movement limiter 37 (refer to FIG. 2D ).
- Movement of the image-sensing device 4 in the direction intersecting with the front-back direction is limited by the positioning hole 35 , and forward movement of the image-sensing device 4 is limited by the movement limiter 37 .
- the image-sensing device 4 is fixed in position so that the light-receiving face 3 a is exposed to the insertion space 33 .
- an adhesive 40 is applied over the region which is from part of the external surface of the wall end 39 including the peripheral edge portion of the positioning hole 35 to part of the external surface of the image-sensing device 4 .
- Part of the adhesive 40 may enter a gap between the external surface of the image-sensing device 4 and the inner surface of the positioning hole 35 .
- the image-sensing device 4 is fixed to the frame 31 .
- the adhesive 40 is applied onto the wall end 39 and the external surface of the image-sensing device 4 , the adhesive is less likely to reach the front surface of the image-sensing device 4 .
- the adhesive 40 does not adversely affect optical connection between the lens unit 20 and the image-sensing device 4 .
- the lens unit 20 passes through the insertion opening 34 , is inserted into the insertion space 33 from the front end 23 a in the direction of the optical axis A 1 , and moves rearward.
- the lens unit 20 is inserted into the insertion space 33 while the movement of the lens unit 20 in the direction intersecting with the direction of the optical axis A 1 (for example, in a direction perpendicular to the paperface and a vertical direction shown in FIGS. 5A and 5B ) is being limited.
- the optical axis A 1 of the lens unit 20 coincides with the optical axis A 2 of the image capturer 3 of the image-sensing device 4 .
- the lens unit 20 is fixed in position to the lens barrel 32 at the position at which the lens unit is optically connected to the image-sensing device 4 .
- the front end 23 a of the lens unit 20 be located separately from the light-receiving face 3 a of the image capturer 3 .
- the position of the lens unit 20 in the front-back direction can be determined in accordance with the resolution capability of the image obtained by the image-sensing device 4 .
- the lens unit 20 at the position at which the resolution capability of the image obtained by the image-sensing device 4 is substantially coincident with the preliminarily-obtained result by simulation.
- the adhesive 41 is applied over the region which is from the front-end portion 32 a of the lens barrel 32 of the frame 31 to part of the outer surface of the lens unit 20 .
- the lens unit 20 is fixed to the frame 31 .
- the image-sensing unit 102 is inserted from the rear side into the attachment hole 51 formed on the housing 50 .
- the frame 31 , the image-sensing device 4 , and the like are disposed inside the first insertion portion 51 a , and part of the lens unit 20 is disposed inside the second insertion portion 51 b.
- the first insertion portion 51 a can be filled with the adhesive 42 .
- the outer surface of the lens unit 20 can be adhesively-fixed to the inner surface of the second insertion portion 51 b by an adhesive (not shown in the figure).
- the imaging module 100 includes the frame 31 that can receive the lens unit 20 in a state where the movement of the lens unit 20 in the direction intersecting with the optical axis A 1 is limited, it is possible to fix the position of the lens unit 20 with a high level of accuracy at the position at which the lens unit 20 is optically connected to the image-sensing device 4 .
- the imaging module 100 since it is not necessary to provide another member interposed between the front end 23 a of the lens unit 20 and the image-sensing device 4 , degradation in imaging performance due to environmental conditions such as temperature or degree of humidity, aged deterioration, or the like is less likely to occur as compared with the structure in which a front end of a lens unit is fixed to an image-sensing device.
- the imaging module 100 it is possible to stably obtain excellent imaging performance.
- the positioning hole 35 that determines the position of the image-sensing device 4 is formed on the wall end 39 of the frame 31 so that the light-receiving face 3 a is exposed to the insertion space 33 , it is possible to fix the position of the image-sensing device 4 with respect to the lens unit 20 with a high degree of accuracy.
- the movement limiter 37 that limits movement of the image-sensing device 4 is formed on the frame 31 , it is possible to fix the position of the image-sensing device 4 with respect to the lens unit 20 with a high degree of accuracy.
- the image-sensing device 4 Since the image-sensing device 4 is only inserted into the positioning hole 35 , it is easy to dispose the image-sensing device 4 at the position that is to be in contact with the movement limiter 37 .
- the aforementioned method of manufacturing the imaging module 100 includes: the first step of positioning the image-sensing device 4 and the frame 31 ; and the second step of positioning the lens unit 20 and the frame 31 , it is possible to fix the position of the image-sensing device 4 with respect to the lens unit 20 with a high degree of accuracy.
- FIG. 7A is a front view showing an imaging module 100 A according to a second embodiment of the invention.
- the imaging module 100 A is in a state where the lens unit 20 is removed therefrom.
- FIG. 7B is a perspective view showing the imaging module 100 A in a state where the lens unit 20 is removed therefrom.
- FIG. 8 is a perspective view showing the imaging module 100 A in a state where the lens unit 20 is inserted into a frame 31 A.
- the imaging module 100 A is different from the imaging module 100 shown in FIGS. 1A, 1B , and the like in that the frame 31 A having a slit-shaped cutout 38 is used.
- the cutout 38 is formed to be directed rearward from the front-end portion 32 a in front-back direction.
- the cutout 38 may be formed in a shape having, for example, a fixed width.
- the cutout 38 is formed on one of four external surfaces 31 a of the lens barrel 32 and at the position corresponding to the center in the width direction thereof (in the horizontal direction shown in FIG. 7A ).
- the cutout 38 may be formed at one portion of the lens barrel 32 and may be formed at a plurality of portions of the lens barrel 32 .
- a second cutout having the same shape as that of the cutout 38 may be provided at the position opposite to the cutout 38 with the insertion space 33 interposed therebetween.
- the number of cutouts may be optionally selected such as two or more.
- the position of the end 38 a (rear end) of the cutout 38 is determined so that external light does not enter the inside of the frame 31 through the cutout 38 .
- the portion having the front-end portion 32 a of the lens barrel 32 is slightly and elastically deformable in a direction in which the width of the cutout 38 increases or decreases.
- the frame 31 A has the cutout 38 , when the lens unit 20 is inserted into the insertion space 33 , it is possible to remove air inside the insertion space 33 through the cutout 38 to the outside from the insertion space.
- the frame 61 is configured so that, the external surface 61 a that is one of four external surfaces of the lens barrel 32 is formed in a curved protrusion shape in cross section (arc shape) in accordance with a design limitation of a housing (not shown in the figure).
- an attachment hole (not shown in the figure) is formed on a housing and has an inner surface formed in a curved recessed shape
- the imaging module 100 A is prevented from being incorrectly positioned in a direction around light axis, and it is possible to incorporate the imaging module 100 A into the housing 50 at a right position.
- the lens barrel 32 of the frame 31 may have a length such that it is possible to accommodate the entire lens unit 20 therein.
- the second step of fixing the positions of the frame 31 and the lens unit 20 is carried out after the first step of fixing the positions of the image-sensing device 4 and the frame 31 ; however, the order of carrying out the first step and the second step is not particularly limited.
- the first step may be carried out after the second step, or the first step and the second step may be simultaneously carried out.
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Abstract
Description
- This application claims priority from Japanese Patent Application No.
- 2016-52157 filed on Mar. 16, 2016, the contents of which are incorporated herein by reference in their entirety.
- Field of the Invention
- The present invention relate to an imaging module, an endoscope, and a method of manufacturing an imaging module.
- Description of the Related Art
- An imaging module used in an endoscope or the like is provided with, for example, an image-sensing unit including an image-sensing device and a lens unit (lens) optically connected to the image-sensing device (for example, refer to Japanese Patent No. 5450704, and hereinbelow referred to as Patent Document 1).
- In an imaging mechanism disclosed in Patent Document 1, an image-sensing device (particularly, a cover that covers the surface of the image-sensing device) and a lens unit are fixed to each other via an adhesive.
- In the imaging mechanism disclosed in Patent Document 1, there is a concern that stability in imaging performance is degraded depending on environmental conditions such as temperature or degree of humidity, and it is desired to increase the stability.
- One aspect of the invention has an object thereof to provide an imaging module, an endoscope, and a method of manufacturing an imaging module, which can stably obtain excellent imaging performance.
- An imaging module according to a first aspect of the invention includes: an image-sensing unit that includes an image-sensing device; a lens that has a front end and is optically connected to the image-sensing device; and a frame that is fixed in position with respect to the image-sensing device and includes a lens barrel having an insertion space, into which the front end is to be inserted in at least an optical axis direction. In a state where movement of the lens in a direction intersecting with the optical axis direction is limited, the insertion space is capable of receiving the lens in the direction such that the lens approaches the image-sensing device. The lens is fixed to the lens barrel at a position at which the lens is optically connected to the image-sensing device.
- In the imaging module according to the first aspect of the invention, the frame has: a first end at which an insertion opening is formed, the lens being to be inserted into the insertion opening; and a second end at which a positioning hole is formed, the positioning hole determining the position of the image-sensing device so that a light-receiving face is exposed to the insertion space.
- The positioning hole may be capable of limiting movement of the image-sensing device in a direction intersecting with the optical axis direction of the image-sensing device.
- In the imaging module according to the first aspect of the invention, the frame may include a movement limiter that limits the image-sensing device fixed in position by the positioning hole from moving into the insertion space.
- In the imaging module according to the first aspect of the invention, the lens barrel may have one or more slit-shaped cutouts formed in a direction from the first end to the second end.
- In the imaging module according to the first aspect of the invention, the frame may be made of a metal.
- An endoscope according to a second aspect of the invention includes the imaging module according to the aforementioned first aspect.
- A method of manufacturing an imaging module according to a third aspect of the invention, includes: preparing: an image-sensing unit comprising an image-sensing device; a lens having a front end; and a frame comprising a lens barrel having an insertion space into which the front end is to be inserted in at least an optical axis direction, the insertion space being capable of receiving the lens in a direction such that the lens approaches the image-sensing device in a state where movement of the lens in a direction intersecting with the optical axis direction is limited; positioning the image-sensing device of the image-sensing unit and the frame (first step); and inserting the lens into the insertion space and positioning the lens in the lens barrel at a position at which the lens is optically connected to the image-sensing device (second step).
- According to the aspects of the invention, since the imaging module includes the frame that can receive the lens in a state where movement of the lens in the direction intersecting with the optical axis is limited, it is possible to fix the position of the lens with a high level of accuracy at the position at which the lens is optically connected to the image-sensing device.
- According to the aspects of the invention, since it is not necessary to provide another member interposed between the front end of the lens and image-sensing device, degradation in imaging performance due to environmental conditions such as temperature or degree of humidity, aged deterioration, or the like is less likely to occur as compared with the structure in which a lens is fixed to an image-sensing device via an adhesive.
- As a result, it is possible to stably obtain excellent imaging performance.
-
FIG. 1A is a front view showing an imaging module according to the first embodiment. -
FIG. 1B is a cross-sectional side view showing the imaging module according to the first embodiment. -
FIG. 2A is a view showing a frame of the imaging module according to the first embodiment and is a front view showing a frame. -
FIG. 2B is a view showing the frame of the imaging module according to the first embodiment and is a cross-sectional view taken along the line I-I′ shown inFIG. 2A . -
FIG. 2C is a view showing the frame of the imaging module according to the first embodiment and is a cross-sectional view taken along the line II-IF shown inFIG. 2A . -
FIG. 2D is a view showing the frame of the imaging module according to the first embodiment and is a rear view showing the frame. -
FIG. 3 is a cross-sectional view showing a front-end structure of an endoscope using the imaging module according to the first embodiment. -
FIG. 4A is an explanatory view showing a method of manufacturing the imaging module according to the first embodiment. -
FIG. 4B is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment. -
FIG. 4C is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment. -
FIG. 5A is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment. -
FIG. 5B is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment. -
FIG. 5C is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment. -
FIG. 6A is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment. -
FIG. 6B is an explanatory view showing the method of manufacturing the imaging module according to the first embodiment. -
FIG. 7A is a front view showing an imaging module according to a second embodiment and is a view showing a state where a lens unit is removed from the imaging module. -
FIG. 7B is a perspective view showing the imaging module according to the second embodiment and is a view showing a state where the lens unit is removed from the imaging module. -
FIG. 8 is a perspective view showing the imaging module according to the second embodiment and is a view showing a state where the lens unit is inserted into a frame. -
FIG. 9A is a view showing a modified example according to a frame and is a front view showing the frame. -
FIG. 9B is a view showing a modified example according to a frame and is a cross-sectional view shown inFIG. 9A . -
FIG. 9C is a view showing a modified example according to a frame and is a cross-sectional view IV-IV′ shown inFIG. 9A . -
FIG. 9D is a view showing a modified example according to a frame and is a rear view showing the frame. - Hereinafter, an embodiment of the invention will be described with reference to drawings.
-
FIG. 1A is a front view showing animaging module 100 according to a first embodiment of the invention. -
FIG. 1B is a cross-sectional side view showing theimaging module 100. Particularly, the position at which an image-sensingdevice 4 is disposed on a flexible wiring substrate 10 (left side inFIG. 1B ) is referred to as a front side, and the opposite side of the front side (right side inFIG. 1B ) is referred to as a rear side. - In the following explanation, the XYZ orthogonal coordinate system may be adopted.
- The Z-direction is a front-back direction of the imaging module, and the X-direction is a direction orthogonal to the Z-direction and is perpendicular to a paperface in
FIG. 1B . - The Y-direction is a direction orthogonal to the X-direction and the Z-direction and is a vertical direction in
FIG. 1B . - As shown in
FIGS. 1A and 1B , theimaging module 100 includes an image-sensingunit 102, aframe 31, and a lens unit 20 (lens). - The image-sensing
unit 102 includes the flexible wiring substrate 10 (wiring part) and the image-sensingdevice 4 which is mounted on theflexible wiring substrate 10. - The
flexible wiring substrate 10 includes: a device-mountedportion 11; and a pair ofrear portions 12 and 13 (firstrear portion 12 and second the rear portion 13) which are bent at both end portions of the device-mountedportion 11, are directed in the thickness direction of the device-mounted portion, and extend toward the rear side. -
Wiring 14 is formed at least on an outer surface of theflexible wiring substrate 10. - As the
flexible wiring substrate 10, for example, a flexible wiring substrate having one surface on which wiring is formed can be used. - The front surface (outer surface) of the device-mounted
portion 11 is amount surface 11 a on which the image-sensingdevice 4 is to be mounted. - A
conductor 2 is electrically connected via aconductive connector 15 made of solder or the like to thewiring 14 formed on therear portion 13 of theflexible wiring substrate 10. - The
conductor 2 is drawn from, for example, an electrical cable (not shown in the figure). - The back (portion including the conductive connector 15) of the
rear portions flexible wiring substrate 10 is covered with an insulatingtube 16 having, for example, electrical insulation. - The insulating
tube 16 is made of, for example, a resin material such as a silicone resin. - In particular, the
flexible wiring substrate 10 is an example of wiring part. - As the image-sensing
device 4, for example, CMOS (complementary metal oxide semiconductor) can be preferably used. - The image-sensing
device 4 includes animage capturer 3 that is to be optically connected to thelens unit 20. - The
image capturer 3 is provided on a front surface of the image-sensingdevice 4. - The shape of the image-sensing
device 4 as seen in the front-back direction is, for example, a rectangular shape (for example, square). - Since the image-sensing
device 4 is mounted on themount surface 11 a of the device-mountedportion 11, theimage capturer 3 is electrically connected to thewiring 14 of theflexible wiring substrate 10 via an electrical circuit formed in the image-sensingdevice 4. - The direction of the optical axis A of the
image capturer 3 coincides with, for example, the front-back direction. - A light-receiving
face 3 a of theimage capturer 3 is the surface intersecting with the optical axis A1 of thelens unit 20. - The light-receiving
face 3 a of theimage capturer 3 is the surface intersecting with the axis direction of the front end (forward end) of theconductor 2. - The light-receiving
face 3 a is, for example, a surface along the XY plane. - A
bump 4 a that is electrically connected to an electrical circuit of the image-sensingdevice 4 is formed on the back surface of the image-sensingdevice 4. - The
bump 4 a is, for example, a solder bump, a stud bump, a plated bump, or the like. - The image-sensing
device 4 is electrically connected to themount surface 11 a of the device-mountedportion 11 of theflexible wiring substrate 10 via thebump 4 a by use of, for example, a flip-chip method. - The
lens unit 20 includes acylindrical lens barrel 20 a; and anobject lens 23 that is incorporated into the inside of thelens barrel 20 a. - The
lens unit 20 is provided in the attitude in which the front end of thelens unit 20 in the direction of the optical axis A1 (thefront end 23 a of theobject lens 23 in the direction of the optical axis A1) is directed to the image-sensingdevice 4. - The optical axis A1 of the
lens unit 20 coincides with the optical axis A2 of theimage capturer 3 of the image-sensingdevice 4. - It is preferable that an outer diameter of the
lens unit 20 be smaller than the maximum length of the external shape of the image-sensing device 4 (maximum length of the external shape in the XY plane). - For this reason, since the length of the external shape of the
imaging module 100 can be limited, it is possible to reduce theimaging module 100 in size. - Light guided from the front side of the
imaging module 100 through theobject lens 23 can be imaged by thelens unit 20 on the light-receivingface 3 a of theimage capturer 3 of the image-sensingdevice 4. - The
lens unit 20 is an example of a lens. - It is preferable that the front end (
front end 23 a) of thelens unit 20 in the direction of the optical axis A1 be located at the front side of the light-receivingface 3 a of theimage capturer 3 so as to be separated from the light-receiving face. - A space between the
front end 23 a and the light-receivingface 3 a is anair space 22. - The
front end 23 a and the light-receivingface 3 a are not in contact with each other, and another member is not interposed between thefront end 23 a and the light-receivingface 3 a. - Consequently, a degradation in imaging performance due to environmental conditions such as temperature or degree of humidity, aged deterioration, or the like is less likely to occur as compared with the structure in which a lens unit is fixed to an image-sensing device via an adhesive.
- As shown in
FIGS. 2A to 2D , theframe 31 includes: awall end 39 which is formed in a rectangular plate shape; and alens barrel 32 which extends forward from the peripheral edge portion of thewall end 39. - The
wall end 39 is formed at the rear end of the frame 31 (the other end, second end). - The
lens barrel 32 has an external appearance that is formed in a square tubular shape having four planarouter surfaces 31 a. - An opening of the front end of the lens barrel 32 (one end, first end) is referred to as an
insertion opening 34. - An internal space of the
lens barrel 32 is aninsertion space 33 into which thelens unit 20 is to be inserted. - The
insertion space 33 is formed in, for example, a cylindrical shape having the central axis extending in the front-back direction, and the cross-sectional shape of the insertion space is circular in shape. - As shown in
FIG. 1B , it is preferable that an internal diameter (length of the internal shape) of theinsertion space 33 be substantially the same as the outer diameter (the length of the external shape) of thelens unit 20 or slightly larger than the outer diameter of thelens unit 20. - Because of this, since the inner surface of the
insertion space 33 comes into contact with or comes close to the outer surface of thelens unit 20, it is possible to limit movement of thelens unit 20 in the direction intersecting with the direction of the optical axis A1. - Consequently, the position of the
lens unit 20 in the XY plane does not vary. - Particularly, the direction intersecting with the direction of the optical axis A1 is, for example, a direction orthogonal to the direction of the optical axis A1 such as X-direction or Y-direction.
- Since the
insertion space 33 can limit movement of thelens unit 20 in the direction intersecting with the direction of the optical axis A1, it is possible to limit thelens unit 20 from tilting. - Accordingly, the direction of the optical axis A1 of the
lens unit 20 does not vary. - The
insertion space 33 is configured to receive thelens unit 20 in a state where thelens unit 20 can be movable in the direction such that it comes close to or approaches the image-sensingdevice 4 and can accommodate the portion including the front end (front end 23 a) at least in the direction of the optical axis A1 of thelens unit 20. - The length L1 of the
lens barrel 32 in the front-back direction can be determined to be, for example, 1.5 times or more of the internal diameter D1 of thelens barrel 32. - Consequently, since the insertion length of the
lens unit 20 can be sufficiently ensured, it is possible to prevent thelens unit 20 from tilting. - The length L1 can be determined to be, for example, three times or less of the internal diameter D1.
- It is preferable that the length L1 be determined so that part of the
lens unit 20 protrudes forward from thelens barrel 32. - The protruding length of the
lens unit 20 from thelens barrel 32 can be determined to be, for example, one-third or more of the overall length of thelens unit 20. - In the case where part of the
lens unit 20 protrudes from thelens barrel 32, since it is possible to hold thelens unit 20 by this protruding portion, operation of adjusting the position of thelens unit 20 in the front-back direction becomes easy. - The
lens unit 20 that is inserted into theinsertion space 33 is fixed to thelens barrel 32 at the position at which the lens unit is optically connected to the image-sensingdevice 4. - The
lens unit 20 can be fixed to thelens barrel 32 by use of, for example, an adhesive 41 (described below) or the like. - The center position of the image-sensing area of the light-receiving
face 3 a of the image-sensingdevice 4 may be displaced from the center of the front surface (surface including the light-receivingface 3 a) of the image-sensing device 4 (decentering position). - Particularly, in the case where the size of the image-sensing
device 4 is small, in many cases in designing an image-sensing device, it is necessary to displace the center position of the image-sensing area from the center of the image-sensingdevice 4. - In this case, the position at which the
insertion space 33 is to be formed in the XY plane can be the decentering position which corresponds to the position of the image-sensing area of the image-sensingdevice 4. - That is, even in cases where the image-sensing
device 4 is decentered in theimaging module 100, it is possible to optically connect thelens unit 20 to the image-sensingdevice 4 with a high degree of accuracy by designing thelens barrel 32 of theframe 31 so as to correspond to the decentering position thereof. - In the case where the outer diameter of the
lens unit 20 is smaller than the length of the external shape of the image-sensingdevice 4, the influence of the displacement due to decentering (for example, displacement in an optical axis position) on imaging performance is likely to be larger as compared with the case where the outer diameter of thelens unit 20 is larger. - In contrast, since the
frame 31 is used in theimaging module 100, the aforementioned displacement does not occur, and even in cases where an outer diameter of thelens unit 20 is small, it is possible to optically connect thelens unit 20 and the image-sensingdevice 4 with a high degree of accuracy. - As shown in
FIGS. 2B to 2D , apositioning hole 35 into which the image-sensingdevice 4 is to be inserted is formed on thewall end 39. - The
positioning hole 35 is formed so as to be able to limit the image-sensingdevice 4 from moving in a direction intersecting with the front-back direction (i.e., a direction intersecting with the optical axis A2 of the image-sensing device 4). - It is preferable that the inner surface of the
positioning hole 35 come into contact with or come close to the side surface of the image-sensingdevice 4 at least two points different from each other. - Consequently, it is possible to limit movement of the image-sensing
device 4 in a plurality of different directions which are directions intersecting with the front-back direction. - For example, the
positioning hole 35 is formed in a rectangular shape (for example, square shape) as seen from rear (refer toFIG. 2D ). - As long as the side surface of the image-sensing
device 4 comes into contact with or comes close to the inner surfaces corresponding to the adjacent two sides of the four sides of thepositioning hole 35, it is possible to limit the image-sensingdevice 4 from moving in a plurality of different directions. - It is preferable that the length of the internal shape (for example, the length of one side of the rectangular shape) of the
positioning hole 35 be substantially the same as the length of the external shape of the image-sensing device 4 (for example, the length of one side of the rectangular shape) or slightly larger than the length of the external shape of the image-sensingdevice 4. - As a result, since the side surface of the image-sensing
device 4 comes into contact with or comes close to the inner surfaces corresponding to the four sides of thepositioning hole 35, movement of the image-sensingdevice 4 in the direction intersecting with the front-back direction (for example, a direction along the XY plane) is limited. - Consequently, the position of the image-sensing
device 4 in the XY plane does not vary. - As shown in
FIG. 1B , thepositioning hole 35 penetrates through thewall end 39, and the light-receivingface 3 a of the image-sensingdevice 4 that is inserted into thepositioning hole 35 can be disposed at the position at which the light-receivingface 3 a is exposed to theinsertion space 33. - The
positioning hole 35 is formed so that the optical axis A2 of the image-sensingdevice 4 coincides with the optical axis A1 of thelens unit 20 provided in theinsertion space 33. - As shown in
FIG. 2D , the length of the diagonal line of thepositioning hole 35 formed in a rectangular shape is longer than the length of the internal shape (internal diameter) of theinsertion space 33. - Therefore, a stepped portion due to a difference in length of the internal shape between the
positioning hole 35 and theinsertion space 33 is formed at the portion of thepositioning hole 35 which includes four corners, and the back surface of the stepped portion is amovement limiter 37 that limits the image-sensingdevice 4 inserted into thepositioning hole 35 from moving into theinsertion space 33. - The
movement limiter 37 is a contact face parallel to, for example, the XY plane. - Since the
movement limiter 37 is formed at each of the four corners of thepositioning hole 35, the image-sensingdevice 4 comes into contact with themovement limiter 37 at the four corner portions, and themovement limiter 37 is fixed in position with a high degree of accuracy. - It is preferable that the
frame 31 be made of a metal such as stainless steel or an aluminum alloy. - In the case where the
frame 31 made of a metal, since a degree of rigidity and a surface hardness of theframe 31 can be higher, it is possible to improve accuracy of positioning of thelens unit 20 with respect to the image-sensingdevice 4. - It is possible to dispose the
lens unit 20 and the image-sensingdevice 4 at a desired position of ahousing 50 by designing theframe 31 so as to comply with anattachment hole 51 of the housing 50 (refer toFIG. 3 ). - (Endoscope)
-
FIG. 3 is a cross-sectional view showing a front-end structure of anendoscope 101 using theimaging module 100. - The endoscope 11011 has a front-end structure including the
housing 50 and theimaging module 100 provided inside theattachment hole 51 of thehousing 50. - The
attachment hole 51 includes: theframe 31; afirst insertion portion 51 a through which the image-sensingdevice 4 or the like is inserted; and asecond insertion portion 51 b through which part of thelens unit 20 is inserted. - The length of the internal shape of the
first insertion portion 51 a is substantially the same as the length of the external shape of theframe 31 or is slightly larger than the length of the external shape of theframe 31. - The length of the internal shape (internal diameter) of the
second insertion portion 51 b is substantially the same as the length of the external shape (outer diameter) of thelens unit 20 or is larger than the length of the external shape of thelens unit 20. - The
first insertion portion 51 a may be filled with an adhesive 42. - The inner surface of the
second insertion portion 51 b can be adhesively-fixed to the outer surface of thelens unit 20 by an adhesive (not shown in the figure). - As long as the accuracy of the length of the external shape of the
frame 31 is sufficiently higher than that of the length of the internal shape of thefirst insertion portion 51 a, even where the accuracy of the lengths of other elements constituting theimaging module 100 is low, it is possible to accurately fix the position of theimaging module 100 with respect to thehousing 50. - For example, a high degree of accuracy is not required for the length of the
second insertion portion 51 b, and even where a space is provided between the inner surface of thesecond insertion portion 51 b and the outer surface of thelens unit 20, no problems occur. - Since a high machining accuracy is not required for the portions other than the
frame 31 and the portion (first insertion portion 51 a) of thehousing 50 which corresponds to theframe 31, the manufacture of theimaging module 100 and thehousing 50 becomes easy, and it is possible to improve the manufacturing yield thereof. - Since the
imaging module 100 uses theframe 31, it is possible to design theframe 31 in accordance with the position or the like of thelens unit 20 which is required to correspond to the product specification of theendoscope 101. - For example, by designing the shape or the like of the
frame 31 in accordance with thehousing 50, it is possible to dispose thelens unit 20 at a desired position. - Additionally, in the case where another functional part is built in the
housing 50 near theimaging module 100, by use of aframe 31 having the shape that can avoid the functional part, it is possible to dispose thelens unit 20 at a desired position. - As stated above, in the
imaging module 100, since it is possible to form theframe 31 in shape corresponding to thehousing 50, it is possible to accurately dispose thelens unit 20 or the like at a required position. - (Method of Manufacturing Imaging Module)
- Next, a method of manufacturing the
imaging module 100 and a method of manufacturing theendoscope 101 will be described with reference toFIGS. 4A to 6B . - (First Step)
- As shown in
FIGS. 4A and 4B , the image-sensingdevice 4 of the image-sensingunit 102 is inserted into thepositioning hole 35 of theframe 31 from the back. - The image-sensing
device 4 moves forward until coming into contact with the movement limiter 37 (refer toFIG. 2D ). - Movement of the image-sensing
device 4 in the direction intersecting with the front-back direction (for example, in a direction perpendicular to the paperface and a vertical direction shown inFIGS. 4A and 4B ) is limited by thepositioning hole 35, and forward movement of the image-sensingdevice 4 is limited by themovement limiter 37. - Consequently, the image-sensing
device 4 is fixed in position so that the light-receivingface 3 a is exposed to theinsertion space 33. - Next, as shown in
FIG. 4C , an adhesive 40 is applied over the region which is from part of the external surface of thewall end 39 including the peripheral edge portion of thepositioning hole 35 to part of the external surface of the image-sensingdevice 4. - Part of the adhesive 40 may enter a gap between the external surface of the image-sensing
device 4 and the inner surface of thepositioning hole 35. - By curing the adhesive 40, the image-sensing
device 4 is fixed to theframe 31. - Since the adhesive 40 is applied onto the
wall end 39 and the external surface of the image-sensingdevice 4, the adhesive is less likely to reach the front surface of the image-sensingdevice 4. - Accordingly, the adhesive 40 does not adversely affect optical connection between the
lens unit 20 and the image-sensingdevice 4. - (Second Step)
- Subsequently, as shown in
FIGS. 5A and 5B , thelens unit 20 passes through theinsertion opening 34, is inserted into theinsertion space 33 from thefront end 23 a in the direction of the optical axis A1, and moves rearward. - In this situation, the
lens unit 20 is inserted into theinsertion space 33 while the movement of thelens unit 20 in the direction intersecting with the direction of the optical axis A1 (for example, in a direction perpendicular to the paperface and a vertical direction shown inFIGS. 5A and 5B ) is being limited. - In a state where the
lens unit 20 is inserted into theinsertion space 33, the optical axis A1 of thelens unit 20 coincides with the optical axis A2 of theimage capturer 3 of the image-sensingdevice 4. - As shown in
FIG. 5B , thelens unit 20 is fixed in position to thelens barrel 32 at the position at which the lens unit is optically connected to the image-sensingdevice 4. - It is preferable that the
front end 23 a of thelens unit 20 be located separately from the light-receivingface 3 a of theimage capturer 3. - The position of the
lens unit 20 in the front-back direction can be determined in accordance with the resolution capability of the image obtained by the image-sensingdevice 4. - For example, it is possible to dispose the
lens unit 20 at the position at which the resolution capability of the image obtained by the image-sensingdevice 4 is substantially coincident with the preliminarily-obtained result by simulation. - Next, as shown in
FIG. 5C , the adhesive 41 is applied over the region which is from the front-end portion 32 a of thelens barrel 32 of theframe 31 to part of the outer surface of thelens unit 20. - By curing the adhesive 40, the
lens unit 20 is fixed to theframe 31. - Accordingly, the image-sensing
unit 102 shown inFIGS. 1A and 1B is obtained. - (Third Step)
- Subsequently, as shown in
FIG. 6A , the image-sensingunit 102 is inserted from the rear side into theattachment hole 51 formed on thehousing 50. - The
frame 31, the image-sensingdevice 4, and the like are disposed inside thefirst insertion portion 51 a, and part of thelens unit 20 is disposed inside thesecond insertion portion 51 b. - The
first insertion portion 51 a can be filled with the adhesive 42. - The outer surface of the
lens unit 20 can be adhesively-fixed to the inner surface of thesecond insertion portion 51 b by an adhesive (not shown in the figure). - As a result, the
endoscope 101 shown inFIG. 3 is obtained. - Accordingly, since the
imaging module 100 includes theframe 31 that can receive thelens unit 20 in a state where the movement of thelens unit 20 in the direction intersecting with the optical axis A1 is limited, it is possible to fix the position of thelens unit 20 with a high level of accuracy at the position at which thelens unit 20 is optically connected to the image-sensingdevice 4. - In the
imaging module 100, since it is not necessary to provide another member interposed between thefront end 23 a of thelens unit 20 and the image-sensingdevice 4, degradation in imaging performance due to environmental conditions such as temperature or degree of humidity, aged deterioration, or the like is less likely to occur as compared with the structure in which a front end of a lens unit is fixed to an image-sensing device. - Consequently, in the
imaging module 100, it is possible to stably obtain excellent imaging performance. - In the
imaging module 100, since thepositioning hole 35 that determines the position of the image-sensingdevice 4 is formed on thewall end 39 of theframe 31 so that the light-receivingface 3 a is exposed to theinsertion space 33, it is possible to fix the position of the image-sensingdevice 4 with respect to thelens unit 20 with a high degree of accuracy. - Since the
movement limiter 37 that limits movement of the image-sensingdevice 4 is formed on theframe 31, it is possible to fix the position of the image-sensingdevice 4 with respect to thelens unit 20 with a high degree of accuracy. - Since the image-sensing
device 4 is only inserted into thepositioning hole 35, it is easy to dispose the image-sensingdevice 4 at the position that is to be in contact with themovement limiter 37. - Accordingly, it is possible to determine the position of the image-sensing
unit 102 with a high degree of accuracy in the front-back direction. - Since the aforementioned method of manufacturing the
imaging module 100 includes: the first step of positioning the image-sensingdevice 4 and theframe 31; and the second step of positioning thelens unit 20 and theframe 31, it is possible to fix the position of the image-sensingdevice 4 with respect to thelens unit 20 with a high degree of accuracy. - Since it is possible to assemble the
imaging module 100 before being incorporated into thehousing 50, it is possible to adjust the position of theimaging module 100 in thehousing 50 by adjusting the insertion depth thereof with respect to theattachment hole 51. - Consequently, in the case where, for example, there is a design limitation such that protrusion of the
lens unit 20 from thehousing 50 is not allowed in theendoscope 101, even where the sizes of a component slightly vary, it is possible to easily avoid an occurrence of a defect product having thelens unit 20 protruding from thehousing 50, by adjusting the position of theimaging module 100 in thehousing 50. - Therefore, it is possible to improve the manufacturing yield thereof.
-
FIG. 7A is a front view showing animaging module 100A according to a second embodiment of the invention. - The
imaging module 100A is in a state where thelens unit 20 is removed therefrom. -
FIG. 7B is a perspective view showing theimaging module 100A in a state where thelens unit 20 is removed therefrom. -
FIG. 8 is a perspective view showing theimaging module 100A in a state where thelens unit 20 is inserted into aframe 31A. - As shown in
FIGS. 7A, 7B, and 8 , theimaging module 100A is different from theimaging module 100 shown inFIGS. 1A, 1B , and the like in that theframe 31A having a slit-shapedcutout 38 is used. - The
cutout 38 is formed to be directed rearward from the front-end portion 32 a in front-back direction. - The
cutout 38 may be formed in a shape having, for example, a fixed width. - For example, the
cutout 38 is formed on one of fourexternal surfaces 31 a of thelens barrel 32 and at the position corresponding to the center in the width direction thereof (in the horizontal direction shown inFIG. 7A ). - In other cases, as shown in
FIG. 7A , thecutout 38 may be formed at one portion of thelens barrel 32 and may be formed at a plurality of portions of thelens barrel 32. - For example, in
FIG. 7A , a second cutout having the same shape as that of thecutout 38 may be provided at the position opposite to thecutout 38 with theinsertion space 33 interposed therebetween. - The number of cutouts may be optionally selected such as two or more.
- The position of the
end 38 a (rear end) of the cutout 38 (position in the front-back direction) is determined so that external light does not enter the inside of theframe 31 through thecutout 38. - As shown in
FIG. 8 , since thecutout 38 is blocked by the outer surface of thelens unit 20 in theimaging module 100A, external light does not enter the inside of theframe 31. - Therefore, it does not adversely affect an image to be obtained by the image-sensing
device 4. - In the
imaging module 100A, since theframe 31A has thecutout 38, the portion having the front-end portion 32 a of thelens barrel 32 is slightly and elastically deformable in a direction in which the width of thecutout 38 increases or decreases. - Therefore, by appropriately determining the internal diameter of the
insertion space 33, it is possible to provide a function of holding thelens unit 20 due to an elastic force to thelens barrel 32. - According to this configuration, since it is possible to temporarily fix the position of the
lens unit 20 by an elastic force of thelens barrel 32, it is possible to easily adjust the position of thelens unit 20 in the front-back direction. - Since the
frame 31A has thecutout 38, when thelens unit 20 is inserted into theinsertion space 33, it is possible to remove air inside theinsertion space 33 through thecutout 38 to the outside from the insertion space. - For this reason, it is possible to avoid the
lens unit 20 from being difficult to be inserted into theinsertion space 33 due to an increase in pressure inside theinsertion space 33. - Next, a
frame 61 which is a modified example of theframe 31 will be described with reference toFIGS. 9A to 9D . - As shown in
FIGS. 9A to 9D , theframe 61 is configured so that, theexternal surface 61 a that is one of four external surfaces of thelens barrel 32 is formed in a curved protrusion shape in cross section (arc shape) in accordance with a design limitation of a housing (not shown in the figure). - For example, in the case where an attachment hole (not shown in the figure) is formed on a housing and has an inner surface formed in a curved recessed shape, it is possible to incorporate the
frame 61 into the inner surface so as to match theexternal surface 61 a to the inner surface. - Accordingly, the
imaging module 100A is prevented from being incorrectly positioned in a direction around light axis, and it is possible to incorporate theimaging module 100A into thehousing 50 at a right position. - While preferred embodiments of the invention have been described and illustrated above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. Accordingly, the invention is not to be considered as being limited by the foregoing description, and is only limited by the scope of the appended claims.
- For example, the
lens barrel 32 of theframe 31 may have a length such that it is possible to accommodate theentire lens unit 20 therein. - In the above-mentioned method of manufacturing the
imaging module 100, the second step of fixing the positions of theframe 31 and thelens unit 20 is carried out after the first step of fixing the positions of the image-sensingdevice 4 and theframe 31; however, the order of carrying out the first step and the second step is not particularly limited. - For example, the first step may be carried out after the second step, or the first step and the second step may be simultaneously carried out.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2016052157A JP6721366B2 (en) | 2016-03-16 | 2016-03-16 | Imaging module, endoscope, and method for manufacturing imaging module |
JP2016-052157 | 2016-03-16 |
Publications (2)
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US20170269349A1 true US20170269349A1 (en) | 2017-09-21 |
US10690905B2 US10690905B2 (en) | 2020-06-23 |
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US15/434,302 Active 2037-09-25 US10690905B2 (en) | 2016-03-16 | 2017-02-16 | Imaging module, endoscope, and method of manufacturing imaging module |
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US (1) | US10690905B2 (en) |
JP (1) | JP6721366B2 (en) |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11445897B2 (en) * | 2016-10-25 | 2022-09-20 | Fujifilm Corporation | Endoscope with holding member having multiple independent wall parts |
CN116430574A (en) * | 2023-06-12 | 2023-07-14 | 之江实验室 | CMOS (complementary metal oxide semiconductor) installation and adjustment device and method for lens image sensor |
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Also Published As
Publication number | Publication date |
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US10690905B2 (en) | 2020-06-23 |
JP2017164280A (en) | 2017-09-21 |
DE102017104021A1 (en) | 2017-09-21 |
JP6721366B2 (en) | 2020-07-15 |
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